<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        header {
            width: 1200px;
            height: 100px;
            background-color: hotpink;
            margin: 0 auto;
        }

        main {
            width: 1200px;
            height: 600px;
            background-color: skyblue;
            margin: 0 auto;
        }

        footer {
            width: 1200px;
            height: 100px;
            background-color: yellowgreen;
            margin: 0 auto;
        }
    </style>
</head>
<body>
    <header></header>
    <main></main>
    <footer></footer>
</body>
</html>